一种高增益交错并联Boost-flyback变换器  

A High Step-up Interleaved Boost-flyback DC/DC Converter

作　　者：吴漾[1] 陈章勇[1] 

机构地区：[1]西南交通大学电气工程学院,四川成都610031

出　　处：《电力电子技术》2016年第4期22-24,共3页Power Electronics

基　　金：国家自然科学基金(51177140);中央高校基本科研业务费专项资金(2682013ZT20)~~

摘　　要：交错并联Boost变换器具有低输入纹波电流、低输出纹波电压等优点,在新能源发电并网领域得到广泛应用。在交错并联Boost直流变换器电路拓扑的基础上,引入倍压单元和耦合电感反激电路单元,提出一种高升压增益DC/DC变换器。该变换器进一步提升电压增益,避免了极限占空比。利用倍压电容有效地吸收了漏感能量并传递至负载,抑制了开关管两端存在的电压尖峰,降低了开关管应力,因此可选取低电压等级导通电阻较小的MOSFET,且无需额外的吸收电路,降低了器件成本,提高了变换器效率。详细分析了变换器的工作原理与特性,进行了理论公式推导,分析了该变换器的器件应力及电路损耗,并通过制作一台100 W的实验样机证明了理论推导的正确性。Interleaved Boost converter with low input current ripple and low output voltage ripple and other advantages, is widely used in the field of new energy power grid.Based on the interleaved Boost DC/DC converter topology circuit with voltage-doubler unit, a coupled inductor interleaved Boost DC/DC converter with high voltage gain is pro- posed by introducing a coupled inductor flyback circuit unit.The proposed converter further improves the voltage gain and avoid the ultimate duty cycle.The leakage inductance energy is absorbed effectively and passed to the load by using the voltage doubler capacitor, the voltage spike caused by the leakage inductance is suppressed, which reduces the voltage stress of the switch, thus the proposed converter without RCD circuit improves its own efficiency and reduces the cost by using low voltage stress MOSFET.The working principle and the performance of the converter are ana- lyzed ,and the relevant theory formulas are deduced ,the stress of switching devices are analyzed in this paper, and the theoretical analysis is validated through an experimental prototype of 100 W.

关 键 词：变换器 高增益 交错 

分 类 号：TM46[电气工程—电器]